Icon for a portion of a display screen



The FIGURE is a front view of an icon for a portion of a display screen showing our new design.

The broken line showing of the square in the FIGURE and the unshaded area within forms no part of the claimed design. The broken line showing of the portion of a display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an icon for a portion of a display screen, as shown and described. 